Customer lifetime value is the number that tells you how much you can afford to spend winning a customer and keeping one. Get it wrong and you either starve growth by underspending or bleed cash chasing customers who never pay back what they cost to acquire.
This calculator builds the estimate the way a finance-literate operator would: monthly revenue, gross margin, churn, and acquisition cost, combined into an expected lifetime and a net profit figure rather than a vanity headline number.
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Monthly revenue per customer
This is the average revenue one customer generates in a month, and it is the base the whole model scales from. Subscription businesses can read it straight off the plan price. Service businesses with lumpy billing should annualize total revenue and divide by twelve, or take the average monthly spend across the active base. Keep the figure realistic rather than aspirational; an inflated monthly number compounds into a wildly optimistic lifetime value once it is multiplied across many months.
Gross margin
Lifetime value is built on profit, not revenue, so margin does the heavy lifting. A software business delivering an extra account at near-zero marginal cost might run 80 percent or higher; a field-service business sending a crew and materials to each customer runs far lower. Using your real margin instead of a borrowed industry figure is what separates a number you can plan against from a number that just looks good in a pitch deck.
Monthly churn rate
Churn is the percentage of customers who leave each month, and it is the most powerful and least intuitive input. The relationship is not linear: average customer lifetime is roughly one divided by the monthly churn rate. At 5 percent churn the average customer stays about 20 months; cut churn to 3 percent and the average jumps to roughly 33 months, lifting lifetime value by more than half without touching price or acquisition. This is why retention work so often beats acquisition work on return. Small churn reductions cascade through every downstream month.
Customer acquisition cost
Enter the all-in cost to land one customer: marketing plus sales expense divided by new customers won in the same window. The calculator subtracts this from gross-profit lifetime value to show net value, and reports the LTV:CAC ratio. Treat that ratio as a signal, not a scripture. A widely cited rule of thumb sits around 3:1, but a high-margin product with a short payback can thrive below it while a thin-margin business may need more. What matters more is the trend in your own ratio and how many months it takes to recover the acquisition cost.
- Building lifetime value on revenue instead of gross profit.
- Treating churn as linear and underestimating how much retention moves the number.
- Comparing your LTV:CAC ratio to a benchmark while ignoring payback period.
- Using a launch-era churn rate that no longer reflects a maturing base.
How to use this calculator
Enter monthly revenue per customer, gross margin, monthly churn rate, and acquisition cost. The result shows expected customer lifetime in months, gross-profit lifetime value, and net value after acquisition cost, plus the LTV:CAC ratio. Re-run it with a slightly lower churn rate to see how much retention is worth before you fund another acquisition push. Everything runs in your browser; nothing you enter is uploaded or stored.
Frequently asked questions
What counts as a good LTV:CAC ratio?
The common reference point is 3:1, meaning a customer is worth three times what they cost to acquire. But the right target bends with your margins, payback period, and growth ambition. A venture-backed company deliberately chasing share may accept a lower ratio temporarily; a bootstrapped business needs a faster, safer return. Watch your own ratio over time rather than anchoring to one external figure.
What is the fastest way to raise lifetime value?
Usually reducing churn, because it multiplies the value of every dollar a customer ever spends rather than adding a single increment. After that, raising revenue per customer through expansion, add-ons, or pricing. Improving onboarding tends to help both at once, since customers who reach value quickly stay longer and buy more.
Does this account for the time value of money?
No. This is an undiscounted model: it sums expected monthly gross profit without applying a discount rate. That keeps it simple and is fine for most planning, though it slightly overstates value for very long lifespans. If you need a conservative figure for financial modeling, a discounted lifetime value calculation will pull the number down.
Important
This tool provides estimates and general-purpose documents, not financial, tax, legal, or professional advice. Verify important results before relying on them.
Support
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